(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | 4 Choose 2 by Prof.Dori (on 28. March 2024, 14:39) | 22 |  97 % |
| SUPER - Buchstabenrätsel / Letter Puzzle by DocLogic (on 24. September 2024, 17:45) | 17 | 92 % |
| Hurra für Zafer! by Richard (on 30. August 2011, 00:00) | 57 | 97 % |
| Japanische Koralle 2358 by Uhu (on 30. December 2016, 19:00) | 55 | 98 % |
| Cross Purposes (Quad Sums Killer Anti-King) by tallcat (on 6. June 2022, 02:42) | 57 | 99 % |
| Someday We'll Meet Again by twototenth (on 29. August 2023, 08:00) | 99 | 97 % |
| Killer X Sudoku #2 by Phistomefel (on 3. February 2020, 16:17) | 95 | 90 % |
| Secrets of Entropy by Mad-Tyas (on 26. December 2022, 03:00) | 39 | 95 % |
| Killer Pentuplet, Little Twins, Little Squares & Odd Knights by SudokuExplorer (on 23. August 2020, 00:00) | 19 | 99 % |
| Irregular Antiking Sudoku by spxtr (on 15. September 2020, 01:45) | 22 | 99 % |
| Hugging Arrows (Disjoint Arrow Sudoku) by EliasKar (on 26. February 2021, 15:11) | 24 | 97 % |
| The Radiant Diamond Ring by fjam (on 18. August 2021, 19:36) | 21 | 91 % |
| Kropki Sums by mathpesto (on 19. December 2021, 16:26) | 21 | 94 % |
| Watch my Sandwich by Angelo (on 7. March 2022, 18:22) | 20 | 97 % |
| Almost Satisfaction by Joseph nehme (on 12. February 2022, 07:15) | 22 | 97 % |
| Gonna (Kouchoku) by Wessel Strijkstra (on 21. October 2022, 12:39) | 18 | 94 % |
| The Slightly Irregular Fire Engine by glum_hippo (on 19. February 2023, 05:51) | 23 | 94 % |
| Run For Cover by 99%Sneaky (on 6. June 2023, 23:47) | 24 | 91 % |
| Foxtrot by zetamath (on 1. August 2024, 18:40) | 22 | 97 % |
| Mounted Archery by Joseph nehme (on 29. January 2022, 08:10) | 68 | 91 % |
